Honestly, it probably wouldn’t have made a difference. The ‘Bernie Bros’ that voted for Trump were largely a myth, not really enough to swing the election, and he’s far enough left (as far as American politics go) that it probably would have ended up with Trump winning more votes from Dems that claims to be centrists.
Aside from that, he’s far enough to the left of most Dems that he probably wouldn’t have been able to get the Speaker to introduce any legislation he favored, so it would have been the same kind of compromise bullshit that Dems always fall for.
Now, Gore? If SCOTUS had let the count proceed instead of calling it for Bush prematurely? Yeah, the world would be a very, very different place.